The price control that would cause a shortage of 20 units of the good is price celling set at $6.
What is price celling ?
A price ceiling, can as well be regarded as the price cap, which is the highest point at which goods and services can be sold.
This serves as the type of price control as well as the the maximum amount in the market, and in the case , that is described above , The price control that would cause a shortage of 20 units of the good is price celling set at $6.
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